70. 灰度图存储

const readline = require('readline');
const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
});

rl.on('line', function(line) {
    if(!this.compressedData) {
        this.compressedData = line.split(' ').map(Number);
        this.rows = this.compressedData[0];
        this.cols = this.compressedData[1];
    } else {
        const x = line.split(' ').map(Number);
        const targetRow = x[0];
        const targetCol = x[1];
        const ix = [];
        for(let i=0; i<this.rows; i++) {
            ix[i] = new Array(this.cols).fill(0);
        }
        let index = 2;
        let currentRow = 0;
        let currentCol = 0;
        while(index < this.compressedData.length) {
            const value = this.compressedData[index++];
            const count = this.compressedData[index++];

            for(let i=0; i<count; i++) {
                ix[currentRow][currentCol++] = value;
                if (currentCol === this.cols) {
                    currentRow++;
                    currentCol = 0;
                }
            }
        }
        console.log(ix[targetRow][targetCol]);
    }
});